html, body {

  box-sizing: border-box;
}


body {
  font-family: 'Raleway', sans-serif;
  padding: 0px;
  margin:0px;

  color:white; /* couleur du texte */
  background-color: black;

  display: flex;
  flex-direction: column;

}



.thumbnail {
  position: relative;
  overflow: hidden;

  border-radius: 2vw 2vw;
}
.thumbnail img {
  position: absolute;
  left: 50%;
  top: 50%;
  height: 100%;
  width: auto;
  -webkit-transform: translate(-50%,-50%);
      -ms-transform: translate(-50%,-50%);
          transform: translate(-50%,-50%);
}

.thumbnail img.portrait {
  width: 100%;
  height: auto;
}